British soldier's equipment 1916-18

The video tutorial discusses the evolution of a soldier's attire and equipment during trench warfare. It highlights the use of a leather jerkin for weather protection, adjustments in carrying equipment like small packs and mess tins, and the strategic placement of the entrenching tool for added armor. The tutorial also covers the replacement of caps with shrapnel helmets for head protection and the introduction of respirators and Mills bombs for defense against gas attacks.

What is the purpose of the shrapnel helmet?

What additional protection is provided by the small box respirator?